Spring bed-bottom



-QNO Modem f 2 Sheenasheet 1.

` F. DE W.GOLVI'N.

SPRING BED BOTTOM.

No. 57o;4z5. l Patented oct. 2j?, 1896.

@Qa/2 Mw M www,

2. t nv nu h s `...w e e h S 9uY N.. Im Vw L0 OB CD .E WB Em Dm .P FS

('No Model.)

No. 570,425. Patented 0013.27, 1896.

-VVi-T- NEEEEE- CQMKOZM UNITED STATES ATENT OFFICE.

FRANK DE VITT COLVIN, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE- I'IALF TO THE FOSTER BROTHERS MANUFACTURING COMPANY OF BAL- TIMORE CITY, OF MARYLAND.

SPRING BED-BOTTOM.

SPEGIFGATION forming part of Letters Patent No. 570,425, dated October 2'7, 1896.

Application filed July 6, 1896. Serial No. 59 8,125. (No model.)

To al?, whom, t may concer/t:

Be it known that I, FRANK Dn Wrrr GoL- VIN, of the city of Baltimore and Stateof Maryland, have invented certain Improvements in Spring Bed-Bottoms, of which the following is a speciiication.

The rst part of my invention consists in forming the spring bed-bottom of a series of arched trusses, each one of which consists of an upper arched member, a lowerchord ortierod,and vertical posts, and in erecting on such trusses volute springs.

The second part of the invention consists in making the arched-truss bed-bottom in two parts, hinged together, whereby it may be folded for convenience in transportation.

In the further description of the said invention which follows reference is made to the accompanying drawings, forming a parthereof, and in Which- Figure l is a top view of the improved spring bed-bottom. Fig.' 2 is a cross-section of Fig. l, taken on the dotted line :n fr. Fig. 3 is an enlarged View of a portion of Fig. 2. Fig. 4 is a top view of the invention embodying certain modifications hereinafter described. Fig. 5 isa section of Fig. 4, taken on the dotted lines y y.

Referring now to Figs. l, 2, and 3 of the drawings, A represents the rails of the bedstead, or those parts thereof which support the bed-bottom. The said rails are shown in section and have the ordinary bar construction.

B B are trusses, consisting of the arched member a, the chord or `the tie-rod l), and the vertical posts c. The ends of the arched members ci., beyond the tie-bars, are turned up and then outward, as shown in Figs. 2 and 3. The trusses are placed at a proper distance apart and connected by the longitudinally-extending flat side bars d at their ends, and the intermediate flat bars e rest on and are riveted to the upper surface of the trusses, as shown in Fig. 3. The tie-bars are springs erected and secured by rivets to the \longitudinallyextending iiat bars d ande.

All the springs on the bars e are of a common length; but the ones on the bars d are shorter, so that the curvature of the general line of the upper ends of the springs will be concentric with the top of the trusses.

The springs are looped together by the wire links D, and around the whole is an endless binding-wire E, secured to the exterior springs by links F.

It will be seen that the edges of the mattress (shown only in dotted lines in Fig. 3) are sustained by the short springs and also by the binding-Wire, so that when the edges are depressed their movement is communicated to every spring in the bottom.

The arched trusses being rigid, they require no support other than the rails of the bedstead.

In the modification illustrated in Figs. 4 and 5 the arched members of the trusses and the tie-rods are in two parts, hinged together at f, so that the bottom may be folded by bending the lateral edges thereof down in the direction indicated by the dotted arrows in Fig. 5. To admit of this folding, the springs at either side of the longitudinal center line of the bottom are not connected together by links, as are the others, but to the bindingwire frame only, which is made in two complete sections, as shown in Fig. 4. The bottom is also devoid of the short volute springs; but the edges of the mattress are supported by the binding-Wire frame, as shown in the construction first described.

I claim as my inventionl. In a spring bed-bottom, the combination of a series of arched trusses tied together to form the base, the ends of the arched members of the trusses being turned up and outward, and a series of inverted conical volute springs erected on the said trusses, the springs at the lateral edges of the bottom being mounted on the oset ends of the trusses, substantially as specified.

2. In a spring bed-bottom, the base thereof formed of a series of arched trusses in two parts hinged together, substantially as speciied.

FRANK DE WITT COLWN. Witnesses WM. T. HOWARD, DANL. Frsnnn.

.sa A 

